riscv: Set xPIE to 1 after xRET

When executing an xRET instruction, supposing xPP holds the
value y, xIE is set to xPIE; the privilege mode is changed to y;
xPIE is set to 1. But QEMU sets xPIE to 0 incorrectly.

Backports commit a37f21c27d3e2342c2080aafd4cfe7e949612428 from qemu
This commit is contained in:
Yiting Wang 2020-03-21 12:18:51 -04:00 committed by Lioncash
parent 6127f08028
commit 1c7f2083da

View file

@ -92,7 +92,7 @@ target_ulong helper_sret(CPURISCVState *env, target_ulong cpu_pc_deb)
env->priv_ver >= PRIV_VERSION_1_10_0 ?
MSTATUS_SIE : MSTATUS_UIE << prev_priv,
get_field(mstatus, MSTATUS_SPIE));
mstatus = set_field(mstatus, MSTATUS_SPIE, 0);
mstatus = set_field(mstatus, MSTATUS_SPIE, 1);
mstatus = set_field(mstatus, MSTATUS_SPP, PRV_U);
riscv_cpu_set_mode(env, prev_priv);
env->mstatus = mstatus;
@ -117,7 +117,7 @@ target_ulong helper_mret(CPURISCVState *env, target_ulong cpu_pc_deb)
env->priv_ver >= PRIV_VERSION_1_10_0 ?
MSTATUS_MIE : MSTATUS_UIE << prev_priv,
get_field(mstatus, MSTATUS_MPIE));
mstatus = set_field(mstatus, MSTATUS_MPIE, 0);
mstatus = set_field(mstatus, MSTATUS_MPIE, 1);
mstatus = set_field(mstatus, MSTATUS_MPP, PRV_U);
riscv_cpu_set_mode(env, prev_priv);
env->mstatus = mstatus;